Boiler-circulator.



D. F.-FRASER.

BOILER CIRCULATOR.

APPLICATION FIITVED was 26. 1914.

Patented Feb; 22,1916.

" unrrnn sT TEsrATENT oF IoETI DOUGLAS FRANKLIN FRASER, BOMBAY, INDIA.

BOILER-CIRCULATOR.

To all whom it may concern: 4

Be it known that I, Doncnas FRANKLIN FRASER, sub ect of the Emperor of India, re-

- siding in Bombay, India, have invented certain new andjuseiul Improrements in Boiler- Circulators, of which the following is a specification.

' fiues are indicated by the circles H.

the stufling boxes D and E and .the thrust This invention relates to.improvements in steam boiler circulators in which the circulating member consists of a small propeller and the shaft of the propeller passes through the bottom. of the boiler and is driven from outside. I

The invention comprises the combination of a nipple, surrounding the shaft and screwed-through the shell of the boiler, a-nut for locking said nipple-and two stufling boxes one at each end of the nipple, said shaft being actuated by steam turbine placed below the boilen' A construction of the'invention is illusshell of the boiler from the inside on to a faced surface and locked by the nut K onthe outside. Leakage is provided against by collar X, which effectually stops all leakage of water i from the boiler. The turbine works in the casing F which is attached to the boiler by means of the flanged collar I which is recessed to accommodate thenut K.-

This flanged collar is bell mouthed and faced to re i e the corresponding flange of the turbine asing F. I s

The turbine is constructed as shown in Figs. 2 and 3, in which two threads to the inch (for example) are cut on the rotor. ,These threadsbear onthe inside of the turbine casing but the blades are, clear of-the Specification of batters Patent.

Patented Feb. 22, 1916.

Application filed June 26, 1914. Serial No. 847,444.

casing and arranged in the. grooves formed by the threads as shown in Fig. 2. Steam is admitted at the port Y (Fig; 2) and exhaustsat" the lower end of the thread, these ports being at a distance apart of approximately half the'circumference of the turbine casing. The blades are flat and are inserted in slots in the threads, which slots are ,cut in the direction of rotation and at about 40 to-a radius passing through the top of the slot. to the casing. I

i The exhaust pipe preferablydischarges into the condenser. Thus an active circula- I tion of water may be secured in allparts of an internally-fired boiler. The turbinemay have a connection with a donkey boiler so as to start circulation as soon as the fires of the main boilers are lighted, after which'it may be supplied from the latter. One or more circulators may be fitted to any one boiler.

What I claim as my invention and desire to secure by Letters Patent is 1. In a water circulator for boilers having a;,shaft passing through the bottom of the boiler and a rotary propeller on the shaft and inside .theboiler, the combination of a nipple surrounding the shaft and having, a

threaded portion which is screwed through the shell of the boiler and projects exteriorly thereof, a nut screwed upon the exteriorly projecting threaded portion of the nipple The inlet port is made tangential and locking saidv nipple iii position, a

flanged collar bolted to the boiler and having a recess within which the saidlocking nut 1S arranged, and two stufling boxes one at each end of the nipple, and means for actuating the shaft. 2. In a water circulatorfor boilers having a shaft passing through the bottom of the "boiler and a rotary propeller onthe shaft and inside the boiler, the combination of a nipple surrounding the shaft and having a.

threaded portion which is screwed through theshell of the boiler and-projects exteriorly thereof, a nut screwed upon-theexteriorly and locking said nipple in position, -a flanged collar bolted to the boiler and having' a 'recess within whichthe said locking projecting threaded portion of the nipple nut is ari'anged, said collar having a flared muwth, a casing bolted b0 the said flared- Lmma 111 testimony whereof I have signed my name to this spucification in the PIBSQIICE of two subscribing witnesses.

DOUGLAS FRANKLIN FRASER. Witnesses:

' JEHANGIR M. RUTNAGUR,

VICTOR VAN-WAILENBONWAY. 

